performing a probabilistic study rather than a determinist one is a relatively easy way to quantify the uncertainty in an engineering design. due to the complexity and poor accuracy of the statistical moment methods, the monte carlo simulation (mcs) method is wildly used in an engineering design. in this work, an mcs-based reliability analysis was carried out for the stability of the chain pill...

A microseismic (MS) monitoring system was established, and numerical modeling performed using Fast Lagrangian Analysis of Continua in 3 Dimensions (FLAC3D) to examine the evolution characteristics MS events during excavation underground caverns under high geostress. Specifically, spatial temporal damage rock mass, dynamic relationship between events, site construction conditions, geological str...

Previous studies have established that the selection of gas extraction borehole parameters is crucial for effectiveness extraction. To more accurately determine reasonable radius boreholes in coal seam, this study was based on actual occurrence conditions body. A coal-seam gas-seepage model, considering dynamic changes permeability under gas–solid coupling conditions, constructed. It combined w...

The left bank of the cushion pond Baihetan hydropower station is a slant and dip slope. gently inclined intra-layer fault zones, steep-dip faults unloading fissures cutting slope to form several potentially unstable blocks. computational results show that stabilities blocks are controlled by zones. A method treatment applying deep replacement caverns load-reduction excavation was proposed reinf...

As a result of the complex geological conditions sand-cobble stratum, various types problems may arise during construction tunnels crossing most prominent which is stability problem face. In order to study tunnel face in first, continuous medium model sandstone soil established, and numerical simulation carried out on three-axis compression test analyze its micro-mechanical characteristics. Sec...

In order to study the optimal coal pillar width and surrounding rock control mechanism of gob-side entry under inclined seam condition, 130205 return air adjacent 130203 gob in Yangchangwan No. 1 well is taken as a typical engineering background. By means background analysis, theoretical analysis based on inside outside stress field, numerical simulation by FLAC3D software, situ industrial test...

Excavation in engineering significantly changes the initial stress state of rock, which makes rock inevitably complex unloading conditions, thus it is great significance to make a profound investigate mechanical characteristics under condition. This paper carried out two different paths including conventional triaxial compression and confining pressure tests on granite specimen from Sanshandao ...

Grouting reinforcement is one of the most effective methods to enhance stability goaf, and its scheme selection, hole location, parameter determination directly affect success or failure goaf treatment. On basis discussion deformation mechanism evolution law longwall this article comprehensively analyzed grouting combined with filling theory, permeability fracturing theory studied physical chem...

Owing to the shortcomings of blindness and inaccuracy when backfilling in goafs based on key stratum theory, we propose “multi-arch pier-column” method. This method involves drilling holes at specific locations surface inject filling slurry materials into goaf separation area under stratum. allows broken gangue be cemented form a stone body, improve its overall strength. process, along with str...